Dynamic Microphone Preamp

These are often found inside old 2way radio microphones.

Notice how the transistor bias current flows through the microphone. A similar circuit can be used with an 8 ohm speaker but in that case you would put it in place of the emitter resistor. This circuit works as a carbon microphone replacement.

Circuit Diagram aka Schematic reverse engineered from circuit board

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so be inspired by it but do not use it as a basis for experimentation or other actions.

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